Wash and peel the white asparagus. Grasp each stem by the head and place the peeler about 2 cm below the tip. Cut off the woody ends (the last 1-2 cm).
For green asparagus, it is sufficient to wash the stalks and peel the lower third or cut off the woody ends generously.
Tie white and green asparagus separately into portions of 7-8 sticks. This makes it easier to lift the asparagus out of the pot.
For the white asparagus, boil about 3 l of water in a wide large pot. Season with 1 teaspoon salt and 1⁄2 teaspoon sugar. Cook for 15-20 minutes depending on the thickness of the stems. For the green asparagus, bring approx. 3 l water to the boil in a second large pot.
Season with 1 teaspoon salt and 1 pinch of sugar. Cook the green asparagus for 8-10 minutes.
Garden test: Poke into the asparagus with a kitchen knife. If the knife slides in easily, the asparagus is cooked.
Lift out cooked asparagus with a skimmer and let it drip off on a tea towel, so it does not soak on the plate.